diff --git a/files/bin/startup.sh b/files/bin/startup.sh
index 37a317c..860c840 100644
--- a/files/bin/startup.sh
+++ b/files/bin/startup.sh
@@ -1,15 +1,17 @@
 #!/bin/bash
+CRONFILE=/opt/tier/tier-cron
+
 #set env vars for cron job
 /opt/tier/setenv.sh
 
 #build crontab file with random start time between midnight and 3:59am
-echo "#send daily beacon to TIER Central" > /opt/tier/tier-cron
-echo "* * * * * /usr/bin/sendtierbeacon.sh >> /var/log/cron.log 2>&1" >> /opt/tier/tier-cron
-echo "#"$(expr $RANDOM % 59) $(expr $RANDOM % 3) "* * * /usr/bin/sendtierbeacon.sh >> /var/log/cron.log 2>&1" >> /opt/tier/tier-cron
-chmod 644 /opt/tier/tier-cron
+echo "#send daily beacon to TIER Central" > ${CRONFILE}
+echo "* * * * * /usr/bin/sendtierbeacon.sh >> /var/log/cron.log 2>&1" >> ${CRONFILE}
+echo "#"$(expr $RANDOM % 59) $(expr $RANDOM % 3) "* * * /usr/bin/sendtierbeacon.sh >> /var/log/cron.log 2>&1" >> ${CRONFILE}
+chmod 644 ${CRONFILE}
 
 #install crontab
-crontab /opt/tier/tier-crontab
+crontab ${CRONFILE}
 
 #create cron logfile
 touch /var/log/cron.log